Changeable Message Signs


The Changeable Message Sign (CMS) files provided below describe the location and status of each Caltrans' CMS located on the State Highway Network.

File formats include CSV, JSON, TXT and XML. Each file format contains the same data set. These files are available for integration into your application and are available via the HTTP protocol. There is no charge for the use of this data.

Conditions of Use

Please read the Conditions Of Use before using these data sets.


Information affecting the CMS feeds:

Data Format and File Layout

Data is available in four file formats that contain the same information to allow easy integration into your application. Included below are the file format layouts:

Data Description

Data in each of these file formats are defined in the following documents:

Data Validation

An XML schema document is provided to validate the data in the XML file:

Deprecated Files

The files listed in the link below are deprecated and should not be used for new software development. Support and documentation for these feeds is limited.

File Locations

Data sets are broken up by Caltrans Districts. A map of the Caltrans Districts can be found here.

Page Modified On: 04/18/18 12:04:16 PM